I just started my pills and I don’t know how they work!

I have done my research and I’m still so confused, maybe you guys could help me? I’m taking loette 21 days te pill and 7 days placebo, but I have so much questions like for example, when on my rest week, could I get pregnant? Considering I’m on my period. Also, do I have that “7 days ovulation” or I don’t, I’m scared all of the time to have relationships in case I screw up big time, please help!!

If you have any suggestions or comments about anything that could help me it’d mean a lot lmao!

Ps: also my partner and i are both STD free so I don’t need to worry about using a condom for that.